Sifter for treating potters&#39; slip, powdered substances, and the like



A. C.'HARRISON.

SIFTER FOR TREATING POTTERS SLIP, POWDERED SUBSTANCES, AND THE LIKE.

APPLICATION FILED APR. 29, I919. RENEWED MAY 4, 1920. R

1,346,452, PatentedJilly13,1920.

" 3 SHEETSSHEIET I. 7 P 1 a 1W5 i I w fi ?'6' f? H %EP EQwQ :7 M kiwi/ MEL-fizz? "ii A. C. HARRISON.

SIFTER FOR TREATING POTTERS SLIP, POWDERED SUBSTANCES, AND THE LIKE. APPLICATION FILED APR. 29, 1919. RENEWED MAY 4, 1920.

1 ,346 ,1:52a Patented July 13, 1920.

3 SHEETS--SHEET 2 m a/w A. C. HARRISON.

SIFTER FOR TREATING POTTERS SLIP, POWDERED SUBSTANCES, AND THE LIKEl APPLICATION FILED APR. 29, 1919. RENEWED MAY 4, 1920.

l ,gfififigu Fatemeal July 13, 1920.,

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

ARTHUR CECIL HARRISON, OF ALSAGER, ENGLAND.

SI FTER FOR TREATING POTTERS SLIP, POWDERED SUBSTANCES, AND THE LIKE Specification of Letters Patent.

Patented July is, 1920.

Application filed April 29, 1919. Serial No. 293,562. Renewed May 4, 1920. Serial No. 380,016.

To aZZ whom it may concern Be it known that I ARTHUR GnoIL I IAn- RISON, subject of the King of Great Br taln and Ireland, and resident of Field House, Alsager, in the county of Cheshire, England, mz'inufacturer, have invented certain new and useful Improvements in Sifters for Treating Potters Slip, Powdered Substances, and the like, of which the followlng 1s a spoolfication.

My invention relates to improvements in sifters for treating potters slip, powdered substances and the like, the object being to provide an improved machine of simple construction and one which can be driven ata high speed without the necessity of a rigid or expensive framework often required to withstand the vibration usually created in sifting apparatus, further objects being means whereby the slip or other mater al is expeditiously and thoroughly sifted, and means for enabling each of the lawn frames to be easily removed examined and washed when necessary.

With the aforesaid objects in view my invention consists essentially in providing a sifting machine constructed in the form of a skeleton frame and having a series of detachable or interchangeable lawn frames placed one above the other with a tray or collecting box underneath the lowermost sieve for the finely sifted or finished slip to pass into the said frame, carrying the lawn frames, oscillating or vibrating on a fixed center or shaft arranged longitudinally and midway of the width of the frame, and oneor more springs connected to each end of the movable frame and also to a fixed foundation, beam, or other suitable structure independent of the rocking frame but in close proximity thereto, so that the springs yield to the oscillation or vibration but always tend to maintain the frame in an upright position.

My invention will be fully described with reference to the accompanying drawings in which,

Figure 1 is a front elevation of a sifting machine constructed in accordance with my invention,

Fig. 2 is an end elevation as seen n the direction of thearrow VV'of Fig. 1,

Figs. 8 and 4 are sectional elevation and end elevation respectively of one of the lawn frames,

' Fig. 5 is an enlarged detail of a clamping device to be hereinafter described,

Fig. 6 1s a cross section through line A-B of Fig. 1, the lawn frames having been removed to make the other parts more clear,

Figs. 7 and 8 are part sectional elevation and cross section respectively of one of the lawn frames, these two views being drawn to a larger scale, and

Fig. 9 is a cross section with the lawn frames removed, of a modification of my invention to be hereinafter described.

In accordance with my invention I construct the frame a rectangular in cross section and of suitable size to support a series of lawn frames Z) 0 and cl of a tapering character and placed one above the other as shown at Figs. 1 and 2, the uppermost sieve 7) of the series having a lawn b of large mesh while the lower sieve has a lawn al of finer mesh to complete the sifting of the slip before it enters the collecting bone. The collecting box e having a discharge outlet at e is fixed to the frame a and forms the lower bearer or support for the lowermost lawn frame (Z, other bearers f and 9 being employed between the detachable lawn frames, these bearers being controlled by pins or projections 7t engaging slots in the frame a or in a plate fixed thereon, the said slots allowing the bearers and g to slightly rise when the lawn frames are being slid in'position from the end X of the machine and to allow all the lawn frames and their bearers to be clamped tightly together by suitable clamping devices such as, for eX-. ample, shown at 70. Each clamping device 7: (four in number) is arranged near each end at the top of the frame a and consists of a screwed rod m passing through a screwed hole 472 in a bracket Z secured to the top member a of the frame. The end m of the rod is connected to a clamping bar a by a plate 0 fixed to the bar and engaging a neck or reduced portion m on the rod on. When the screwed rod m is rotated by the handle m the clamping bar or takes against the top edge of the upper lawn frame 6 and forces all the lawn frames and bearers tightly together, the pins 7t and slots j hereinbefore referred to allowing the bearers g and f to move downward. Strips of flannel or the like material p are secured to the top and bottom edges of each bearer to make a close joint with the lawn frames.

The detachable or nterchangeable lawn framesare of a tapering'character with mclined lawns 6 0 m, the frames being open attheir projecting ends 1", and having a cross stay 4 serving as a handle which enables them to be readily withdrawn and placed in position againas desired. i V Inorider to take up the slack Of the lawn stretched across the'base of each lawn frame (see sections at Figs. 3, 7 and 8) I employ an eccentricallyl mounted roller 10 extending transversely of the lawn frame, the said roller: being'covered with flannel or other suitable fabric ,v To tighten the lawn or other sifting medum the roller wis partly rotated, the swell 10 on the roller taking againstthe lawn as shown at Fig. 8.

The slip issupplied to the machine through the pipe .sitshown' dotted at Fig. 1) on to the top" inclined lawn 6 through which it passes, beingdirected to the to pend of the next lawn a by an oppositely inclinel partition t the slip .beingxconveyed through all the lawns in precisely the same way, and collected in a receiver or box 6 arranged under the lowermost lawn frame al The coarser particles, or. tailings, of the slip gradually work their way off the'lawns and over the openprojecting ends, 1" of the lawn frames into a receptacle u, a suitable guard or chute n being employed to assist its direction. By

' this means the slip is thoroughly sifted and the coarser particles are separated therefrom and collected duringrthe oscillatoryior vibratory-motion of the sifter. If desired the guard omay extend vertically in front of all the sieves'and may be closed up when the machine .is sifting by a hinged door, detachable apron, or strip of fabric.

An important feature of my invention is the combined means I employ for obtaining an oscillatory or-vibratory andshaking mo-f brackets 3, bearings 1 secured to a foundation being employed forthe shaft 2to move in. Hinged to the upper enact the machine at 6 (see Figs. 1, 2'and 6) is a connecting rod 7 receivlng a to and fro motion from an eccentric, cam, crank on a driven shaft or by other suitable means causing the machine to rock or swing sidewise on the center 2, spring, rubber or other buffers 8 being employed at each corner of the frame if desired. Arranged at each end of the machine and opposite the ends of the longitudinal shaft 2 is a spring 9 composed of a number of flat spring plates ofvarying height as shown at Fig. :2. The upper end of each spring 9 is secured to the machine frame at 10 by means of a bracket 11, the'lower-end of eachspring 9 beingsecured, by means of a bracket 12 to a suitable foundation 5. These springs 9. are normallyvertical but yield or bend and work in unison with the rocking or shaking action of the machine.

F 9 is a cross section of a modification of my. invention the lawn frames having been removed therefrom to clearly show the position of the bearers f and g and the collecting box or receptacle -6.' In this case the bearers g and f and lawn frames are placed lower down and the center or fulcrum 2 is arranged on a suitable structure above the machine,.say for example, 011 a beam 14, the connecting rod 7 being hinged to the lower member of the machine a. i The spring 9is connectedto the frame a' and to the beam or structure 14, rubber buffers 8 being secured to the beam; The machine is swung to and fro on thecenter 2 in the direction of the arrows Y the springs 9 work ing therewith 1301310111106 the rocking and shaking action as before stated. The springs 9 always tend to force themachine into a vertical position, and this exertion incombination with the rocking action produces a shaking and vibratory action.

The machineis operated as follows'z- The lawn frames Z), 0 and cl are slid in position over the bearers, the clamping devices in are 'thcnoperated to bind all the lawn frames and bearers together. The machine is then set in action and a supply of slip is passed through thepipes on to the top lawn 6 through which it passes and on to the other lawns c and (Z and. into the box 6 the slip then pasing through the opening 6 to. a trough or other conveyer which conveys it to a suitableplace to be further treated; The

coarser particles pass'over the ends 1 of each lawn :frame into a receptacle u, the latter being detachableso as to beeasily emptied and placed back again.

IVhat I claim as my invention and desire to secure by Letters Patent is 1. In siftingmachines, the combination with a skeleton frame and a' fixed base, sievingelements supported on the frame, a shaft arranged longitudinally of the frame and j disposedintermediate the'width thereof, of

spring members connected to the frame and fixed base, and means for rocking the frame on the shaft. I I

2. In a sifting machine, a stationary base,

a shaft on the stationary base, a frame In testimony whereof I have hereunto set mounted to 001; on said shaft, sieving elemy hand in the presence of two Witnesses. ments on t e rame, vertica leaf spring members positioned adjacent each end of the ARTHUR CECIL HARRISON frame and having connection therewith, and WVitnesses:

means adapted to rock the frame on the J. BENTON, shaft. PATTIE PLANT. 

